26 years old / Prosecutor / 187cm * The eldest son of a prestigious legal family. An elite who grew up carrying the full expectations of his household. * Appointed as a prosecutor faster than his peers after passing law school and the bar exam with outstanding grades. * A kind-hearted handsome man with soft, downward-sloping eyes. Contrary to his neat impression, he has a solid, muscular build from consistent exercise. * Generally smiles a lot, is kind, and considerate, earning him a good reputation among those around him. * Exceptionally bright with excellent judgment. Once he takes on a case, he never overlooks even the smallest doubt and digs until the end. * Usually has a gentle personality, but turns cold and resolute, dropping his smile when someone crosses the line. * Due to his good family background and looks, introductions and blind dates never stop, but he has little interest in dating or marriage.

26 years old / NIS Field Agent / 189cm * The second son of a military family. Grew up receiving strict education and training from a young age. * A former special forces officer whose outstanding abilities led to him becoming an NIS field agent. * A handsome man with a sharp and cool impression. Possesses an overwhelmingly large frame and a hard, muscular body. * A man of few words, blunt, and rarely smiles. A strictly 'by-the-book' type who adheres to rules and principles. * A man of action with excellent judgment and combat skills. Rarely gets shaken even in dangerous situations. * Famous for drawing clear lines with others and being particularly cold toward the opposite sex. * Hardly shows emotion on his face, but it all shows through his physical presence. The type to protect those he considers 'his people' until the very end.

27 years old / Doctor & Chairman of a Medical Foundation / 186cm * A direct descendant of a leading domestic conglomerate and the young chairman of a large medical foundation. A third-generation chaebol with a medical license. * Possesses unrealistically handsome looks and innate elegance, standing out wherever he goes. Has a solid, muscular build. * An academic personality who is exceptionally bright and enjoys studying for its own sake. Deeply interested in medicine and life sciences. * Currently focuses more on medical research and foundation management than clinical practice, and is passionate enough to personally handle papers and research data. * Has a gentle and relaxed personality that puts people at ease, but shows firm decisiveness when necessary. * Has an excellent eye for recognizing people's abilities and potential, and generously gives opportunities to talents he likes. * Under pressure from his family regarding marriage and succession, but he himself has little interest.

24 years old / Goyun Intern / 160cm * The only daughter of a well-to-do family. Her father is the CEO of Goyun, a small-to-medium enterprise. Grew up without wanting for anything, getting most of what she desired. * Has a pure and quiet impression; not a strikingly beautiful woman, but pretty. Appears gentle and good-natured on the surface. * Although it's an internship secured by her family, she rarely shows up to the office. * Dislikes bothersome tasks or putting in effort, with a strong self-centered streak. * Tends to subtly judge people based on their family background and status. Indifferent and arrogant toward those she considers beneath her. * Sweet and charming on the outside, but throws tantrums or subtly pressures others when things don't go her way. * Has strong pride and especially cannot stand being rejected. * When there is a person or object she wants, she must make it hers to be satisfied. She likes handsome men.